Micrometer gauge



Nov. 6, 1928.

y J. LAMB HICROMETER GAUGE Filed spt. 2s, 1927 INVENTOR. 723e 77 cu-n A TTORNEY.

Patented Nov. 6, 1928.

T n 1,690,733.. UNITED STATES PATENT OFFICE.

JOSEPH LAMB, 0F DETROIT, MICHIGAN.

MICROMETER GAGE.

Application flied September 28., 1927. Serial No. 222,419.

rlhis invention relates to improvements in n'iicrometer gauges, and aims to provide a gauge which may be easily and accurately read.

lt is an object of theinvention to provide a micrometer gauge wherein a sleeve is movable longitudinally along a main stem, and a member is arranged on the sleeve in such a manner that it is permitted limited movement'so that one Scale on the member may be moved across` calibrations on the main stem thereby also moving a pointer on said member with respect to a graduated scale on the sleeve. y y' Another object of the invention is to pro vide eleven graduations on the movable member which occupy the same total length as ten calibrations on the main stem with which they register; and to provide single pointer, also on the movable member, which may register with, or between, any two of a number of graduations'on the scale on the sleeve. y A further object of the able member moves over the main stem calibrations at a. very slight angle to their direction, so that the total movement of the member from one end `of the calibrations to the other moves its graduations a distance exactly equal to one-tenth of that between two adjacent. calibrations; and again the move-ment of the member from one end of the calibrationsl to the other moves the pointer from thefirst to the last graduation on the sleeve.

Having broadly outlined the major purposes of the invention Iwill now describe an embodiment thereof with the aid of the ac` compan ying drawing, in which:

Figure 1 illustrates a side view of the invention. Y

Figure 2 is a section on the line 2-2 of Figure l, and

Figure 3 is a detail showing part of the main stem, the sleeve and the rotary member. Figure 4 is a partial viewV of a modilied form of construction, and

Figure 5 is a section on the line 5-5 of Figure 4. i Y

Referring to the drawings, it will be noted that Figures 1, 2 and 3 show the application of the invention to a circular main stem, and Figures 4 and 5 illustrate the invention when a multisided main stem is employed.

invention is to pro-v vide micrometer gauge wherein the movrment of `the finger in. both directions.

i 13, for engaging the slot 1,1 so as to limit the sleeve to longitudinal mevei'nent along the said stem.

0n the periphery of the main stem for any desired distance therealong calibrations 14 are inscribed vwhich usually extend around about one-fifth of the circumference. These calibrations, which are generally marked off attenth of an inch intervals, must be so positioned that their upper and lower ends are longitudinally in line with one another.

Held against one end of the sleeve 12, as by a retainer 15, is a rotary member 16 having an outwardly projecting finger 17 thereon.` 18 designates a projection'on one side of the retainer having gradu'ations 19 thereon with each of which an index 20,011 the finger'l' maybe brought into alignment by turning the member 16. Stops Q1 towardsth'e ends of the projection 18 limit the turning move- The rotary member 1G is so shaped as tobcar against the circumference of the main stem 10,;and is provided with graduations 22 on one of its longitudinal margins. These gradu ations are preferably eleven in mimber and the whole eleven occupy the same total distance as any ten calibrations 14`on the main stem.

In the construction shown in the drawings the movement of the member 16 is around the main stem andthe calibrations 14 thereon are so inclined that the total turning` movement of the member 1G between the pins 21 moves each graduation thereon vexactly onetenth the distancebetween two calibrations on the stem. Obviously the stops 21 limit the turning movementof the rotary member so that it may only travel between the ends of the calibrations 14, andalso so that the index 20 may only move between thev first and last graduations 19, usually ten in number, on the projection 18. y

Qldesignates an arm on the sleeve 12 between which and the upper surface of the base 28 measurements are taken.

Referring nowl to Figures 4, and 5, the main stem 10 in this case is shown multisided, and has a sleeve 125a therearound.` One side of the stem l()a` is provided with calibrations 14'L1 at uniform intervals, usually a tenth of an inch apart.. It will be noted that in this lOl) to the length of the main stem. 12x"L guides 2a are provided for a sliding inemy j l A therefore 2.1545.; When desired the graduated scale r19a may be subdivided so that f the latter.

case the calibrations are shown at-.right angles In the sleeve ber 16a, and 26'designatesascrew rotatablyV mounted on the sleeve which is in threaded engagement with a nutQT secured'to one' side of the sliding memberl: l On one margin of the latter adjacent to the main stem and parallel `iviththe ,graduations on the latter graduations 22a are inscribed, generally eleven in number, which occupy the same total length as Vany ten calibrations '149. on the main stem. On one of the guides adjacent toene side of .the slidingrmember a .plurality oi graduations 19a are provided, and on the ad.` jacent -niargin oi the sliding Ymember an index-2Gl inscribed'. This index mark moves betvveen the irstand lastgraduations 19ai as the sliding member nieves ltransversely across the vlength ot the calibrations lila. Y It will ,be noted that theguidesQLlare slightly inclii'ied'tothe length ot' thesliding member ,soi that` as the sliding member k,16a travels the full length of tliecalibrations 14n, and also the full distance betiveen` the first and last graduationslQ?, it has niovedlongitudinally along the main stem a distance eX- that between two adjacent calibrations.

Vtlhile in Figuresl andvthe calibrations klll are shown somewhat inclined,` and the movement ot the rotary member 15 is at, right angles to the main rstem at right angles 4to its axis, and in Figures 4 land 5 the calibrations are at right angles lto the stemand the movement of the sliding member isinclined, it is obvious that the calibrations 1l, or 1li, may either be at rightangles to, oi lined to, the length of the'stem so long as the member 16, or 16, moves longitudinallyalong,the main item onetenth of tlie'distanc'e between tivo adjacent calibrations as it travels the length of In order to obtain a reading on the rgang ,(3 a piece of Werl; is placed With one end ot the base 28, the sleeve is moved downwards until 1 site end ofthe vvork. kThe re: v 1 taken as follows In Figure l for tance the arm comes into contact Withthe oppo-l the reading,ttalren first ii'ointhe calibrations on the main stem is 2 and something. To asceri tain the decimals the slidinginember has been moved to the leit until one ot' the graduations thereon has. registered `with a calibration onythema-in stem. It will be seen thatiii this case the graduation 5 registered lwith the calibray .tion 6, so that our reading so far is 2.15, since while the index 00? has travelled over the graduated scale 19 so there the `reading is approximately l1/z.y The Whole reading is.'`

lquarters or even tenths of thousandths may be accurately read.l i

Yl/ifliile in 'the foregoing the preferred embodiment of the invention has been described and shown it is understood that the invention is subject to such modifications as iallwitliin the scopevot the appended claims. l Vilhat- I claim as my kinvention and desire to secure by Lettersjatent is l. In a micrometer gauge, the combination of amain stein having calibrations thereon,

a sleeve slidable longitudinally on said main stemlhaving a graduated lscale thereon, and

a member movable yon saidf sleeve` havingl graduations on one oi' its margins any one of .which graduations is adapted to' be brought into register With one of said calibrations, and said member ralso having a ixed index thereonadaptedfto moreover said. graduated scale.

MZ. yIna micrometer gauge, the vcombination ot a main stem having calibrations thereon substantially at right angles to itslengtli, a

sleeve slidable longitudinally onsaid main stem, and a member movable'y on saidV sleeve at a slight angle to the length ot said calibrations, said member having graduations on one of its margins which are adapted to bermoved vacross said calibrations,"and n ixed index thereon, said sleeve having a` graduatedV scale thereon with Which said index is adapted to register. f A Y l, f f

. 3. In a micrometer gauge, they combination as 'described in claim 2 wherein stops are provided onr tliesleeve forlimiting the movement f of said movable member so that the vlatter may only move the full length of the calibra-y tions fduring which movement the graduations on said movable member. move laterally a dis-` t-aiice requal to one tenth thedistan ce between two adjacent calibrations, and `wherein the graduations on4 the/movable men ber are so spaced'that eleven of theinoccupythe same total distanceon the memb ras ten calibra-v tions onthe main stem. 4 1 f l. In a n'iic'rometer gauge, the combination oi armain stem. having calibrations thereon, a sleeve slidabl'e longitudinally on said main stem, a member on said-sleeve permitted liniited rotary'inovenient thereon-land having graduations ron one ot its margins adjacent to said calibrations so thatsaid member may Y be moved,'aroundsaid,stem unt-il one oi its graduations coincides with one 'of said cali?y brations, a fixed projection on said sleeve havino aA graduated scale thereon, and a finger on sa'idfmember liavingan indes; thereon adapted rto registeren saidl graduated scale.' Y 

